It is actually the Soviet invasion of Afghanistan
I think he is reminding the American people that our
ancestors fought hard to establish this country. He tells that we should proud of who we are
and where we come from and we should always defend the ideals of democracy both
here and abroad.
B) The candidate must be a native-born American citizen
The Declaration of Independence was the u.s. telling Great Britain that we wanted to be independent from them. The Constitution is the laws and principles of the Untied States. When something is questioned to be legal the constitution is consulted.