After a rise in settlement, the western frontier was closed by the year

The settling of people on land in the western regions during 19th century is known as westward expansion. It started with the Louisiana purchase. It was sustained by the Oregon Trail, Manifest Destiny and the Gold rush. There were many westward expansion trails that helped the immigrants and between 1600 and 1870 to expand toward the western regions of USA, three years after the superintendent of the Census announced the western frontier was closed in 1893.  US government also facilitated the migration by passing Homestead acts.

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.

i think the answer is: cuba wanted to be independent from spain, and the u.s. wanted to end spanish rule in the west.

hope i

-lavira : )