Imperialism

Imperialism, state policy, practice, or advocacy of extending power and dominion, especially by direct territorial acquisition or by gaining political and economic control of other areas. Because it always involves the use of power, whether military or economic or some subtler form, imperialism has often been considered morally reprehensible, and the term is frequently employed in international propaganda to denounce and discredit an opponent’s foreign policy.

https://www.britannica.com/topic/imperialism

a system in which a country rules other countries, sometimes having used force to get power over them:

the age of imperialism

a situation in which one country has a lot of power or influence over others, especially in political and economic matters:

She accused the United States of economic imperialism.

https://dictionary.cambridge.org/dictionary/english/imperialism

Definition of imperialism

1: imperial government, authority, or system

2: the policy, practice, or advocacy of extending the power and dominion of a nation especially by direct territorial acquisitions or by gaining indirect control over the political or economic life of other areasbroadly : the extension or imposition of power, authority, or influenceunion imperialism
https://www.merriam-webster.com/dictionary/imperialism

Quest for a general theory of imperialism

The main trend of academic thought in the Western world is to follow Schumpeter’s conclusion—that modern imperialism is not a product of capitalism—without paying close attention to Schumpeter’s sophisticated sociological analysis. Specialized studies have produced a variety of interpretations of the origin or reawakening of the new imperialism: for France, bolstering of national prestige after its defeat in the Franco-German War (1870–71); for Germany, Bismarck’s design to stay in power when threatened by political rivals; for England, the desire for greater military security in the Mediterranean and India. These reasons—along with other frequently mentioned contributing causes, such as the spirit of national and racial superiority and the drive for power—are still matters of controversy with respect to specific cases and to the problem of fitting them into a general theory of imperialism. For example, if it is found that a new colony was acquired for better military defense of existing colonies, the questions still remain as to why the existing colonies were acquired in the first place and why it was considered necessary to defend them rather than to give them up. Similarly, explanations in terms of the search for power still have to account for the close relationship between power and wealth, because in the real world adequate economic resources are needed for a nation to hold on to its power, let alone to increase it. Conversely, increasing a nation’s wealth often requires power. As is characteristic of historical phenomena, imperialist expansion is conditioned by a nation’s previous history and the particular situation preceding each expansionist move. Moreover, it is carried forth in the midst of a complex of political, military, economic, and psychological impulses. It would seem, therefore, that the attempt to arrive at a theory that explains each and every imperialist action—ranging from a semifeudal Russia to a relatively undeveloped Italy to an industrially powerful Germany—is a vain pursuit. But this does not eliminate the more important challenge of constructing a theory that will provide a meaningful interpretation of the almost simultaneous eruption of the new imperialism in a whole group of leading powers.