what significant legislative acts lead up to our current era of immigration, history help

What would you argue as the most significant legislative acts leading up to our current era? Briefly list the various legislative acts and describe their impact.

The 1965 Act Changed the Face of America

here are some sources it only needs to be about 2 paragraphs or more

http://www.npr.org/templates/story/story.php?storyId=5391395 (Links to an external site.)

Three Decades of Mass Immigration

http://www.cis.org/articles/1995/back395.html (Links to an external site.)

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