Until the 1900s immigration to the United States was fairly simple because of the need for...

Explanation:

The 19th century in U.S saw massive industrialization all over the country. It led to a massive need of workforce and labor to work on these industries. At the same time, new cities started to grow in the country with industrialization and urbanization.

To meet the demands of the new cities, industries started manufacturing more steel, iron, textiles, etc. which all consequently led to the need of more workers and labors in the country.

earlier philosophers whose work influenced the enlightenment included bacon, descartes, locke, and spinoza. the major figures of the enlightenment included beccaria, diderot, hume, kant, montesquieu, rousseau, adam smith, and voltaire. it spread the ideas of the enlightenment across europe and beyond.