The united states didn't fight anyone for Texas directly, Texas fought Mexico for independence None however admitting the Republic of Texas as a state did lead to the Mexican American War.
South Carolina
Bombing of Pearl Harbor/WW2, or state which war
Texas
Kansas
New York State was part of the United States of America. If the US goes to war, all states must comply. It is illegal for any ONE state to go to war by itself. If, for example, New York started a war with Great Britain, it would be illegal. Texas went to war with Mexico in 1836; but Texas was NOT part of the United States of America. Texas was it's own Republic (it's own country) until 1845. In 1845, Texas became a US State; it would have been ILLEGAL for Texas to go to war with Mexico after 1845.
this question doesn't really make scence Easy, The communists won the war. They took the "mainland" and the Nationalists fled to Taiwan to make their own country. Check wikipedia regarding Taiwan and its formation.
State governments cannot declare war or issue their own money.
State governments cannot declare war or issue their own money.
West Virginia
The Vietnam War was part of the cold war. To prevent Communist North Vietnam from taking over the Republic of South Vietnam.
The Roman Republic was just a city-state in Italy and not involved in the Persian War 499-449 BCE, which was between Persia and the Greek city-states of the eastern Mediterranean.