At one time, the US government collected taxes only through
taxes and imports.
The a
Amendment to the Constitution allowed the federal government to collect taxes on income.
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16th Amendment in the US constitution, announced the tax on the income (after a certain limit) of the citizens.

Explanation:

The 16th amendment in the US constitution, put the tax of the citizen's income (after a certain limit). This amendment was passed by the congress on 2nd July 1909 and ratified February 3, 1913

Before this, the US government could charge the taxes on imports and imports only. In the United both state and federal government has different areas to charge taxes from the citizens.

At one time, the US government collected taxes only through  sales taxes and imports.  The Amendment to the Constitution allowed the federal government to collect taxes on sixteenth  income.

Explanation:

The Sixteenth Amendment of the U.S Constitution permits Congress to give emphasis on income tax without allocating it among the states on the basis of population. Maximum federal revenue came from tariffs rather than taxes,though Congress imposed excise duties on it.

The first federal income tax was introduced by the Revenue Act of 1861, again it was revoked in 1872. All federal income taxes were unconstitutional. Supreme court did not hold it. It held income taxes on rent, dividends and interests. These are all direct taxes and divided among states on the basis of population.

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