2. What were the motivations for American expansion in the Pacific?

The westward expansion of the United States during the 19th century was not limited to North America, but rather included an ongoing push to establish a stronger U.S. presence in and across the Pacific Ocean. This maritime expansion, driven mostly by commerce, had important implications for U.S. foreign policy.

do u wanna me in my question and ill do your question?

a big one is

to appoint and regulate officers of the land and naval forces,

which caused much controversy ending the articles