Mainly, for two reasons in my opinion:
To help the the economy of the country from which the goods came.
tariffs
Grenville Program
the supply curve will fall if heavy indirect taxes are imposed. A price will worsen the burden of suppliers which force them to cut the supply of goods.
Only collected on imported goods
The Mexican government limited Immigration to Texas and levied taxes on goods imported from the United States.
To help the the economy of the country from which the goods came.
Mainly duties (taxes on imported goods).
Taxes are levied and collected in order to 1) pay for public services such as government, police and roads; and 2) to regulate the amount of goods exchanged such as taxing imported sugar to promote domestic sugar consumption.
these are taxes on imported goods
tariffs
The term used for taxes of imported goods is usually a Tariff and sometimes called a Duty or Customs Duty.This is why you sometimes see duty-free shops in airports or cruise ship terminals. Goods purchased in these shops are not charges the Duty or Tariff.
set taxes on imported goods
They are taxes placed on imported goods to increase the price and protect locally produced goods which may cost more than the imported similar goods.
Townshend Act
executive or lesgislative or judical
Increase in old taxes and new taxes on imported goods to raise money for England.