The power to acquire territories is an example of ''Inherent'' type of powers of the national government.
The power of national government are of three types Expressed Powers, Implied Powers, Inherent Powers. Acquire territories are example of inherent power. A branch of government may exercise inherent rights that are not expressly granted by the constitution.
They are authority granted to a branch of government, such as the executive branch, to carry out the fundamental functions of the state. They are solely employed by the government to carry out its obligations and function properly; they are not powers or rights that are available to private individuals or corporations.
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