The United States purchase of the Louisiana Territory in 1803 was geographically important because it:

provided full access to the Mississippi river

Explanation:

The Louisiana Purchase almost doubled the size of the country. It was unexplored but had millions of acres of fertile farmland and other natural resources. It also gave the US control of the Mississippi River.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.