Canada, Mexico, and the United States
Answer:
1. The declaration of independence
2. The Constitutional Convention
3. World War 1
4. World war 2
5. 9/11
Explanation:
A planet in motion remains in a stable orbit around the sun mainly because of two things: the nature of the gravitational force and because virtually no other forces act on the planet. The momentum of a planet changes during its orbit but not, in general, its inertia -- which relates solely to its mass.
