Answer:
There is a total of 50 states
Explanation:
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
PennsylvaniaRhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Immigrants and children worked in factories
One way in which the travels of Marco Polo and the voyages of Zheng He are similar is that both "<span>(2) stimulated trade," since these voyages brought new trade routes and trade planning containing over-seas navigation into effect. </span>
I think the correct answer from the choices listed above is the second option. Rome was protected from invasion from the east by the Apennines. <span>The Apennines divide the Italian peninsula in half and allowed the Romans to mass forces for counter-attack whenever they were threatened.</span>