Which of the following correctly outlines historical large-scale global migration patterns during the late 18th through early 20th centuries?

Why did Liberia remain independent from European control after the Scramble for Africa?

Thomas Malthus was a prominent academic in the late 1700's and early 1800's. What was his field of study?

Given Ireland's current population of 4.6 million people, was the population of Ireland higher, lower, or roughly the same before the Great Irish Famine?

What problem did population theorists of the Industrial Revolution think the world's rising population would cause?