Answer:
Tides are the periodic rise and fall of surface water caused by the gravitational force of the moon and the sun and by the rotation of the earth. The movements of the solar system that influence the tides are predictable; therefore changes in tide height and time are predictable.
All of the names on the map are Irish, so the map suggests that Irish immigrants may take over the United States by the 1900s.
You
may well be right about people's fears that immigrants, lots of them
from Ireland, would overrun the country. Look up when the potato famine
was, though. The map may be from the early 1900s, but, if so, not about
the potato famine in Ireland.
I hope this helps.
The U.S doubled the size of its territory
The British and Spanish returned New Orleans and Florida to the United States. The United States was allowed to fish above the 49th parallel.
