The Navy’s tactic of using helped win the Mexican-American War and the Civil War. A. Torpedoes

B. Blockades

C. Radar

D. Smuggling

It is b

Explanation:

i had to do a little research

a is wrong because torpedoes weren't developed until 1866 and the war was april 25, 1846-Feburary 2,1848

c is wrong because radar wasn't 1935

and d i don't know  

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.

c. the king has significantly abused the colonists' rights many times over a long period of time.