How did the descendants of Abraham and Jacob become enslaved?

They were brought to America on slave ships. The black man in America is the Seed Of Abraham. Black men in America were enslaved for 400 years by a fake god (White Jesus).

Long story short:While living in Canaan, Jacob's ten oldest sons conspired to kill their seventeen-year-old brother Joseph, then relented from murder and sold him into slavery instead. As a result, Joseph ended up in Egypt (Genesis 37:27, 28).

Because of his faith and unwavering devotion to God, Joseph was blessed in everything he did (Gen. 39:23), despite numerous "ups and downs." Eventually, at about the age of thirty, he rose to a position of prominence in Egypt second only to the Pharaoh himself (Gen. 41:39-41). This appointment was due in large part to the interpretation of a dream of Pharaoh's that God revealed to Joseph, which allowed for Egypt to make preparations against a severe famine which would last for seven years (Gen 41:15-37).

When the famine struck, the residents of neighboring lands sought to purchase grain in Egypt (Gen 41:57), including Joseph's own brothers who had sold him into slavery some thirteen years before (Gen. 42:1-3).

Ultimately, after revealing himself to them (and forgiving their previous wrong against him, as it was truly God's doing, and not their own - Gen. 45:8), Joseph urged his brothers to bring Jacob and all his household from Canaan to Egypt, specifically the land of Goshen (Gen. 45:9-11), where Joseph could provide for and watch over them all. Thus Jacob (Israel) and "all his descendants" came to dwell in Egypt (Gen. 46:6, 7). So Israel dwelt in the land of Egypt, in the country of Goshen; and they had possessions there and grew and multiplied exceedingly. (Genesis 47:27)

After Joseph died (Gen. 50:26), "there arose a new king over Egypt, who did not know Joseph. And he said to his people, "Look, the people of the children of Israel are more and mightier than we; come, let us deal shrewdly with them, lest they multiply, and it happen, in the event of war, that they also join our enemies and fight against us, and so go up out of the land. Therefore they set taskmasters over them to afflict them with their burdens. And they built for Pharaoh supply cities, Pithom and Raamses." (Exodus 1:8-11).

That's just a brief summary, as the story covers the last thirteen chapters of Genesis and the first chapter of Exodus; but essentially, that's how the descendants of Abraham and Jacob became enslaved to the Egyptians.

[Quotes from NKJV]