The United States sent military forces to the Balkans during the 1990s in order to rescue people from atrocities committed against them--"crimes against humanity"--and to take the assertive action that NATO as a peace-keeping enterprise could not take to end the war.
Answer:
a comet
Explanation:
When far from the sun, a comet is like a stone rolling around the universe. But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
C, coal changed the game and increased production by increasing speed and efficiency.
The Americans got involved in the Vietnam War because they did not want another Communist party to hold Vietnam as its captive. Vietnam along with other South East Asian countries have undergone communist rule from China and France, Americans did not want to see that happening again, that's why they aided or supported the Vietnamese from the war that they were waging against communist countries.
