Final answer:
Wallerstein used the term 'core nations' to describe the countries that industrialized first, such as Britain, France, and Germany, which dominated global trade and economic policy.
Step-by-step explanation:
The term Immanuel Wallerstein used to describe the nations that industrialized first is core nations. According to Wallerstein's World Systems Theory, these core nations are dominant capitalist countries that are highly industrialized, technological, and urbanized. These nations, which include the likes of Britain, France, and Germany, have established themselves as economic powerhouses that exert control over the global economy, exploiting both semi-peripheral and peripheral nations.
The core nations have amassed wealth and influence through policies and systems that favor them, such as free trade agreements like the North American Free Trade Agreement (NAFTA), allowing them to maintain their dominant positions in global trade and economic legislation.