When did the United States own all the lands from Atlantic Ocean to Pacific Ocean?
Check this site for the territorial history of the U.S.
http://xroads.virginia.edu/~MAP/terr_hp.html
The United States owned all the land from the Atlantic Ocean to the Pacific Ocean after the completion of the Louisiana Purchase in 1803. To find this answer, you can follow these steps:
1. Historical knowledge: Understanding the history of the United States is key to finding the answer. The United States expanded westward throughout the 19th century, acquiring new territories and land through various means.
2. Identify major land acquisitions: The United States made several important land acquisitions that contributed to its ownership of lands spanning from the Atlantic Ocean to the Pacific Ocean. The most significant acquisition was the Louisiana Purchase.
3. Research the Louisiana Purchase: The Louisiana Purchase took place in 1803 when the United States bought a vast territory from France, which encompassed land beyond the Mississippi River, reaching all the way to the Rocky Mountains. This acquisition effectively doubled the size of the United States and opened up the potential for westward expansion.
4. Confirm the extent of the lands owned: The land acquired through the Louisiana Purchase, combined with later acquisitions and treaties, expanded the United States' ownership westward until it reached the Pacific Ocean. This includes the present-day states of Louisiana, Arkansas, Missouri, Iowa, Oklahoma, Kansas, Nebraska, parts of Minnesota, North Dakota, South Dakota, Montana, Wyoming, Colorado, New Mexico, Texas, and eventually California, Oregon, and Washington.
Therefore, the United States owned all the lands from the Atlantic Ocean to the Pacific Ocean after the Louisiana Purchase in 1803.