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The kingdom went into decline from the mid-16th century CE when the Portuguese, put off by the interference of Kongo's regulations on trade, moved their interests further south to the region of Ndongo. The latter kingdom had already defeated a Kongo army in 1556 CE.
Chinese merchants would trade with Africa to obtain salt. They can offer silk, paper and gunpowder in exchange for the salt.
Trade resulted in sharing of goods and ideas with different cultures and people across the world. Medieval period had many trade routes but one of the most important was the Silk Road. It connected East Asia and Southeast Asia with Persia, South Asia and the Arabian Peninsula.
Different trade routes were specialized in different products and they used to exchange their specialized products to get other products. Like Europe had iron; Africa had gold, salt and ivory; Arabian Peninsula specialized in perfumes and dates; textiles and cotton were from India and China was famous for silk, paper and gunpowder.
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Immigration does not fall under the domestic policy. A domestic policy differs from foreign policy, which refers to the ways a government advances its interests in world politics.
I wanna say C.The Navigation Acts set limits to what the colonists were allowed trade with others
