First off, it was because of manifest destiny- the dream to acquire all land from the Pacific Ocean to the Atlantic Ocean.
Also, the south wanted new territories because they needed new farmlands; tobacco heavily stressed the soil
Alaska
philipines
Before the war Hawaii was annexed. After the war Guam and Puerto Rico were annexed which remain Territories and the Philippines which was granted independence after WW2.
In 1839, the United States did not acquire any new states. However, the year is notable for the ongoing disputes and developments related to territories, particularly regarding Texas, which was an independent republic at the time. The U.S. would eventually annex Texas in 1845, but that acquisition did not occur in 1839.
Mexico.
Alaska
They still hold Guam and Puerto Rico as US Territories.
philipines
They still hold Guam and Puerto Rico as US Territories.
The Revolutionary War
Before the war Hawaii was annexed. After the war Guam and Puerto Rico were annexed which remain Territories and the Philippines which was granted independence after WW2.
The US purchased Louisiana from France, to acquire the control of the port of New Orleans, of the River Mississippi and the French territories west of that river, thus avoiding they could fall in British hands.
in the year 1848
Most of the US Imperial territory was taken from the Spanish in the Spanish-American War in 1898. Some other territories came as a result of negotiations with the other Great Powers and some more territories came as a result of World War II.
Naval bases
Naval bases
Naval bases