The number one thing that helped spread the belief was the population growth. America need more room for more immigrants.
The 3 nations signed the NAFTA to lift all trade embargoes between the 3 countries. This meant free trade, without them being taxed for bringing their goods into the country
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The correct answer to your question would be D.
The Rape of Nanjing was significant because of the sheer volume of people who were massacred, because it was actually a direct act of manipulation and terrorism, these two things made also the United States more attentive towards the happening in the Pacific as it saw that the Japanese had an increased growth in influence over this region.
On June 29, 1947, as the first president to address the National Association for the Advancement of Colored People (NAACP), Harry Truman pledges his support for upholding the civil rights of all Americans.