It affected them negatively, the idea of Manifest Destiny is that God has given us as explorers the right and destiny to take any land we discover as our own. this, of course, led to the forcing of native peoples to leave their land in order for the invaders to live there.
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The U.S. invaded the Caribbean island of Haiti (B) in 1994 until 1995 in order to reinstall a new government in Haiti following the 1991 coup d'etat which overthrew a democratically elected leader.
The domestic manufacture of new machine guns that civilians could purchase was effectively banned by language in the Firearm Owners Protection Act of 1986 (also known as "McClure-Volkmer"). The language was added in an amendment from William J. Hughes and referred to as the Hughes Amendment.