Marisa had spent her time investigating, and made her preparations. Soon when the Texas War of Independence broke out in 1835, the Magician begun to aid the Texans against Mexico. The war went on as usual, though Texas has more victories then OTL. When the Battle of the Alamo took place, the Mexicans almost managed to achieve victory. Marisa had managed to appear at that battle site just when it was closing. She went and used her Mini-Hakkero, and within seconds, the invading forces were crushed. From there, the War of Independence had been achieved.
Soon after, its independence was recognised by Belgium, France, Netherlands, and the US at first. Mexico still had refused to recognise them, and still claimed them as a territory. Fighting between the two nations continued on, mostly at sea and along the coastlines. In 1842, when the Battle of Salado Creek took place, and Marisa used her Mini-Hakkero once again to defeat the invading forces. Finally, war between the two nations would come to an end, and Mexico went to finally recognise Texas as independent.
Marisa's power and aid would influence the Texan Government, and many people would support remaining independent. Relations between Texas and the US remained decent, though the offers of admission into the US was kindly declined by the Texans, as a majority didn't want to join the nation. Relations went sour once James K. Polk was elected as the next President of the US. Polk went on to constantly try to offer Texas to join, but when they refused, he responded with war.
What was thought to be an easy victory at first, it heavily backfired once Marisa entered the war. The Magician went on to defeat the US Forces with lots of danmaku and her Mini-Hakkero. Polk wouldn't give up however, as he continued the invasion with full force. This didn't help at all, and the Texans continued to achieve more victories. By June 1846, Polk finally decided to give up and officially surrendered. A peace treaty was then signed ending the war.
Shortly after the war, more nations went on to recognise Texas. Most notable of these were the United Kingdom, Russia, Sweden, and Spain. Disgusted as the US attempts to gain a nation that preferred to be independent, the United Kingdom would annex all of Oregon County and made it a part of Canada, and not sell any of it. Some nations also cut relations with the US, especially the United Kingdom. Much tensions were felt in North America, though had slightly declined once Polk left office in 1849.
Texas went on to rebuild relations with Mexico, and later on became allies. Texas also became allied with the United Kingdom and Spain, as well as the lowland countries. A few years later in 1858, Marisa Kirisame was elected as President of Texas.
In 1861, the Confederate States went on to cede from the US. The Civil War went on as usual, however, the CS also attempted to take Texas. The attempt failed, and Marisa decided to launch an invasion of the unrecognised nation. With Texas intervening, the CSA was quickly defeated by 1863. With this, Texas-US relations begun to see some more improvement.
Meanwhile in other areas of the World, not much was going on. Denmark managed to win the Battle of Schleswig back in 1848, and kept the area. In 1870, Japan went on to purchase Alaska from Russia. Soon, Japan manages to discover gold in the area, and the territory soon was admitted as a Prefecture. China had their own Meiji Restoration-esque beginning in 1870, as did Korea. Reimu decided to go on a worldwide tour, and also ends up never establishing the border.
In 1894, the First Sino-Japanese War took place as usual. With an industrialised China and Korea, Japan had a difficult time in fighting. Nevertheless, the Japanese managed to gain Taiwan, Penghu, and the Liaodong Peninsula along with having Korea in the Japanese Sphere by 1898. Soon, tensions between Russia and Japan emerged.
Back in North America, the Cuban War of Independence broke out in 1895. Spain went on to fight against the rebellion. By the last three months of the war, the US went and intervened, in support of Cuba. Shortly afterwards, Marisa went to aid her ally Spain, which led to the War of the Caribbean. The war came to a close four months later, with Spain keeping Cuba, Puerto Rico, and Guam. Marisa also went on to aid Spain in taking back the Philippines, which was successful.
Later in 1901, Reimu stopped by in Texas to tour the area. Along the way, she ran into Marisa. After a while, Reimu went on to tell her about Japan. Soon, Marisa decided to open relations with Japan by 1902, and Japan did the same. Marisa also went to establish relations with Thailand and China as well.
Time went on, and in 1914, the First World War broke out. Texas went to join in on the Allied side. The war went on as usual, and Japan managed to gain German colonies in the Pacific. It comes to an end in 1918, with a victory for the Allies. Russia falls into a revolution and is succeeded by the Soviet Union.
The Interwar Era followed. Many nations were prospering, save for the Central Powers. The Republican/Kuomintang Government in China managed to defeat the Warlords and Communists, with the aid of Seiga. In Japan, Mononobe no Futo became elected as Prime Minister, and went to turn the nation into a liberal democratic state. With this, Futo managed to prevent the Militarism from rising, and democracy remaining strong, even after Emperor Taishō's death.
More years passed by, and in 1939, the European War broke out. Germany was invading Poland, and Italy was invading the Balkans. Spain and Texas soon joined in the war in 1940 on the Allied side, and Marisa herself went on to participate as well. Within the next few months, the Axis was suffering huge defeats, and by 1943, the war came to an end. While all of Germany was freed fully by the Allied Powers, the Soviets managed to secure the Balkans and Poland, turning them into satellite states.
The Cold War then emerged, between the Soviets and Comintern Pact against Texas and Allies. Marisa had established the Atlantic Defence Pact, which consisted of Western Europe (except Switzerland), Canada, Mexico, Denmark, Norway, and Texas. In Asia, a Communist rebellion took place in Korea, but was put down by Japan. Some other communist revolutions took hold in other parts of the world as well. Tensions in North America by this point was gone, and the Foreign Relations of the US with other nations had improved overall, save for the Comintern. The US also joined the Atlantic Defence Pact in 1956.
In the 1960s, the Space Race occurred between the Soviets and Texans. The Soviets went and managed to have the first satellite, and first human in space. Following this, Marisa decided to make her goal of having the first person on Luna. By 1967, this had been achieved, and the Magician herself even went to Luna. During her trip to Luna, she ended up meeting the Lunarians, and also met with Watatsuki no Yorihime. A few hours later, Marisa and her crew went back to Earth, and much celebration was held in Dallas.
At the end of the 1980s, the Comintern fell apart, and the Soviet Union had dissolved by 1989, succeeded by the Russian Federation. Yugoslavia also fell apart, with Slovenia, Croatia, and Bosnia-Herzegovina gaining independence. Montenegro, Macedonia, and Serbia remained united, having saved Yugoslavia from collapsing fully.
Marisa still remains President of Texas to this day.
(World by 2013.)-------------
In a different timeline, the point of divergence takes place in the 600s. The Frisian Kingdom had been established. Meanwhile a Time Machine appears, and doors opened. Both Yuyuko Saigyouji and Youmu Konpaku walk out, and begin observing their surroundings. What they weren't aware of, was that the Frankish Empire had planned to take the nation someday...