Why would a government put a restriction on the number of goods that can be imported into their country?

Governments restrict imports for four basic reasons: For some governments, particularly in the developing world, tariffs provide a significant source of government revenues

answer; the nazca plate is converging with the south american plate

without the article i believe the answer could be a because algeria is a low soci-economic country in africa and most countries that ahve such qualities lack womens rights