The Muscovite principalities were a collection of small states in the region of Muscovy, which is now part of modern-day Russia. These principalities emerged during the late medieval period and were characterized by their feudal systems, where local rulers held power over their territories. The most significant of these principalities was Moscow, which eventually grew in influence and became the center of political power. Over time, the Muscovite principalities united under the leadership of Moscow, leading to the formation of a centralized state. This unification was crucial in resisting external threats, such as the Mongol invasions, and laid the groundwork for the future expansion of the Russian Empire.