Canaan itself was conquered afresh, and the Canaanitish captives--the "mixed multitude" of the Bible--assisted the Israelites in erecting the monuments of their conqueror.
Nevertheless, the people multiplied.

The memory of the Hyksos invasion had not passed away, and the Pharaoh and his subjects alike feared the possibility of other invaders from Asia being joined by their disaffected kinsfolk in Egypt itself.

That their fears were justified is shown by what happened less than a century later.

When the Nineteenth dynasty fell in the midst of civil war, a Canaanite, Arisu by name, seized the throne and made himself master of Egypt.

Ramses determined to prevent such a catastrophe by destroying as many as possible of the male children of the Hebrews.