China and India were already booming in human population but what really caused Europe to increase in population?

Agricultural revolution

Explanation:

As soon as the agricultural revolution rolled around the population in Europe proceeded to rise. A continuity throughout the world, (Continuity means a continuing idea) was where you have extra food you have more people. New types of farming lead to more food, more food lead to more people.

lying without the limits of the several states; and may permit them, at such times, and in such manner as it

a. competition between france and england for land and power