Question

which type of geographic tool would best help show where immigrants to the us moved over time?
a world map showing immigration routes
a bar graph showing total immigration numbers
a us map showing population distribution
a timeline of changes in immigration policies

Explanation:

A world map showing immigration routes would visually represent the movement paths of immigrants to the US over time. A bar - graph shows numbers, a US map of population distribution doesn't focus on immigrant movement, and a timeline of immigration policies shows policy changes, not movement.

Answer:

A. a world map showing immigration routes