The best answer is B. <span>The number of skyscrapers increased a lot because there was no room left on the ground. Instead of expanding vertically, companies are left with no choice but to expand infrastructures horizontally because of the mass transit system in the cities.</span>
Answer: b
Explanation: just because
Use of ground troops: Americanization used US ground troops to fight the war whereas Vietnamization used S.Vietnamese ground troops to fight the war.
Johnson moved the US from an aid and financial backer to a ground force with men in active duty on the front lines in addition to naval and air support. Nixon's policy removed the ground troops, leaving the S. Vietnamese to fight that on their own (with our aid and money) but continued our air strikes and naval support.
Each was a natural trading partner.
Taking a side in that conflict would have had bad consequences for the U.S., the proverbial no-win situation.
This answer to this would be A.
