Spain and Portugal were the two nations that had a head start in the age of exploration
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Because LBJ, under the Tolkien Resolution, was given basically infinite power to protect U.S interests in Vietnam. Thus, President Johnson continued to "escalate", or build up American forces, weapons, and intervention in Vietnam. Now, somewhat opposite of this would be "Vietnamization" under Nixon, which was the gradual withdrawal of American troops but a continuation of supplies in order to aid South Vietnam from the Vietcong.
The main effect of the system of sharecropping and debt peonage put in place in the south after the civil war is :
b. african americans were prevented from leaving the plantations where they had been enslaved
So basically those African Americans were trapped into more work for in order to "pay up" their debt
hope this helps