The brain. Modern homo sapiens such as humans have much larger brain than the early homo sapiens due to the fact that food at the time was becoming scarce so the need for the homo sapiens to become smarter was a necessity. And because of this early homisapiens brains evolved to become much larger than what they were before
What is the question here??
Definition of imperialism
imperial government, authority, or system
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 areas
broadly : the extension or imposition of power, authority, or influence
<em>Hope that helps!!!</em>
It's purpose was to ban slavery in the territory acquired from Mexico during the Mexican War