What was the main goal of supporters of “manifest destiny” in the 1840s?

 The main goal was the push westward.

Explanation:  Both government and individual felt nothing should stop the all-powerful drive to expand the size of the country.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

the answer is b just took the test