Why might a president kill a bill
using a pocket veto?

A pocket veto occurs when Congress adjourns during the ten-day period. The president cannot return the bill to Congress. The president's decision not to sign the legislation is a pocket veto and Congress does not have the opportunity to override.

According to lumenlearning.com, "Its stated objective was to free the newly independent colonies of Latin America from European intervention and avoid situations that could make the New World a battleground for the Old World powers so that the United States could exert its own influence undisturbed."

Explanation: