The author of the novel uncle tom's cabin was:

harriet tubman
frederick douglass
harriet b. stowe
stephen douglas

 Harriet B. Stowe

Further detail:  

Harriet Beecher Stowe's novel, Uncle Tom's Cabin, was hugely popular with abolitionists around the world.  The book was the 2nd-best selling book of the 19th century -- coming in behind only the Bible (the perennial bestseller).

In response to Stowe's book, British women compiled a petition that got so many signatures it filled 26 leather bound volumes, in which they urged their sisters in America to keep up the fight to free the slaves.  The impact of Stowe's book shows that what can be done fighting with the pen is just as mighty as what might be done with a sword!

answer; i believe the two groups were irish immigrants and chinese immigrants;

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."