After a more disastorous Shays Rebellion (for the US, that is), the Empire of Vermont was formed, which included all of New England. The remaing 9 states signed the Constitution, and the modern US was born. In 1812, the better equiped and armed American Army seized all British holdings in the Caribbean, and they were organized into 6 territories, and Long Island was captured from Vermont. Also, areas of western Canada became American.
In 1856, the American-Mexican War began. When the war ended in 1857, all of Mexico north of the Rio Grande (except for Texas) was in American hands. Baja California and northern Mexico too was in American hands. Texas remained independent from the US. In 1858, Cuba was bought from Spain, and divided into two territories (Cuba and Havana).
The 6 Caribean territories were granted statehood in 1868, after the Civil War, and the two Cuba territories in 1876. Alaska was not bought for various resaons.
In 1914, the Great War began. American forces captured all of New York from Vermont, and all of Canada from Britian. Also, Mexico was devastated by the war, and slipped into a Communist revolution in 1917. Tanks were used excelently by American forces in this war. Currently, the American empire included Panama, Phillipines, Indochina, Dutch West Indies, the British and French Guineas, all formed German and Portugesse colonies, and Ceylon, and comprises of 62 states (the big star represents the Federal Government).