Final answer:
The practice of a nation increasing its power through the acquisition of colonial territories is called imperialism. It involves the domination of weaker nations by a stronger nation, politically, socially, and economically. One of the main motives of nineteenth-century imperialism was gaining access to raw materials.
Step-by-step explanation:
The practice of a nation increasing its power by gaining colonial territories is known as imperialism.
Imperialism is a policy in which a strong nation seeks to dominate other countries politically, socially, and economically. It involves the economic, political, and military domination of a strong nation over weaker nations. European countries, such as Great Britain and France, practiced imperialism by carving up and claiming territories around the globe.
One of the main motives of nineteenth-century imperialism was gaining access to raw materials. European powers sought to exploit the resources of their colonies to support their growing industries. This allowed them to have a steady supply of resources for manufacturing and trade.