What was the significance of the 38th parallel before the korean war? when us troops moved north of it, the chinese decided to fight. it was the location of the yalu river boundary between north korea and china. it served as the boundary between north korea and south korea. it marked the first site of north korean aggression.

Review the statement. after the spanish-american war, the united states gained control of samoa, guam, and puerto rico. which options most accurately analyze how this expansion transformed the united states? (select all that apply.) a. it prevented the united states from developing its economic might. b. it allowed the united states to establish a military presence abroad. c. it established its presence on the world stage as an imperial power. d. it led to an increase in tension between the united states and canada.