What was the main reason that the United States sought to build a canal in Central America in the early twentieth century? A.
to create jobs for unemployed US citizens still struggling to recover from a severe economic depression
B.
to prevent Spain from using its powerful navy to control trade in Central America and the Caribbean
C.
to improve diplomatic relations with Colombia by helping the country improve its infrastructure
D.
to allow goods to be shipped more efficiently between the East and West Coasts of the United States

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.