There are many ways that imperialists accomplish the expropriation of land, including overt war, and more subtle means like grain dumping to destroy subsistence farmers. This theft accomplishes a few things in favor of capital. The conqueror can use that land and extract whatever is in it and on it. And as the people are dispossessed — no longer able to live on the land – they become dependent on jobs. This is how the working class is created and continuously resupplied. It also creates the consumer: without land, we have to pay for food, shelter, and all our other needs.