Imperialism: The Highest Stage of Capitalism

According to Lenin, what are the key differences between early capitalism and late-stage capitalism?

How does imperialism spring from capitalism? Why does Lenin believe imperialism to be the intrinsic final end of capitalism, regardless of the intentions of those with power and influence?

In Lenin’s view, how are capitalism and colonialism associated with one another? How do colonialism and the exploitation of developing countries further capitalist ends?