4. During the late 19th and early 20th centuries, U.S. foreign policy was closely tied to domestic economic
concerns. The annexation of Hawaii, the Open Door policy with China, and the construction of the
Panama Canal in Latin America were all motivated by an interest in
(a) limiting the power of labor unions to strike
(b) acquiring new markets and sources of raw materials
(c) extending land grants for railroad construction
(d) breaking up monopolies and trusts