Invasions by Barbarian tribes
Economic troubles and overreliance on slave labor
The rise of the Eastern Empire
Overexpansion and military overspending
Government corruption and political instability
Answer:
A nation is a group of people who share some similarities, that can be language, culture, customs, and so on.
A state is a political authority that has territorial control over one specific area. Most states have the monopoly of the use of force.
FInally, sovereignty is the quality that a state has to govern over a specific territory without outside interference.
Mnay states are nation-states, meaning that the same nation also forms a state (for example, Japan), but other states are multinational entities where several nations live together (for example, Russia or India). And sovereignty is a quality that every state possesses, otherwise, they would not have legitimacy over the territory that they hold.
In several ways, the performance of the Gestalt psychologists labored as a forerunner to the rise of cognitive psychology in America. Behaviorism developed at the beginning of the 20th century and converted into a dominant force in American psychology. John B. Watson and B. F. Cognitive Championed by psychiatrists, cognitive psychology concerns the consideration of physical mental methods—all of the notions that go on inside your understanding, including knowledge, reasoning, consciousness, awareness, communication, problem-solving, and learning.
