The primary contribution of the muckrakers in the late 1800's and early 1900's was to • encourage public support for the building of the Panama Canal
lobby the Federal Government to open more free land to western settlement
• promote the ideals of rugged individualism and laissez-faire
• expose corruption and negligence on the part of big business and government

expose corruption and negligence on the part of big business and government

Explanation:

Muckrakers refer to the novelists and journalists of the Progressive Era who help to expose corruption in government and big business.

These journalists also exposed America's problems brought on as a result of the growth of cities and rapid industrialization.

The primary contribution of the muckrakers in the late 1800's and early 1900's was to expose corruption and negligence on the part of big businesses and government.

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