According to hebrew traditions, it was around 1250 bce that moses led them out of

according to hebrew traditions, it was around 1250 bce that moses led them out of Egypt

The Hebrews were subsisting as laborers in Egypt.  The head of this group was a prophet which was designated as Moses. Moses directed the Jews out of servitude in Egypt and directed them to the Devine Land that God had prompted them. The diversion of the Jews from Egypt is recognized by Jews every year in the celebration of Passover.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

the answer is use of support