How did the entrance of Europeans into the trade markets impact Songhai?

How did the phoenicians add to the goods available in their marketplaces?

Why was the sixteenth amendment important to woodrow wilson’s efforts to regulate the economy? a) the sixteenth amendment lowered interest rates charged by banks. b) the sixteenth amendment allowed congress to levy an income tax c) the sixteenth amendment lowered tariffs on imported goods d) the sixteenth amendment allowed congress to break up monopolies

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?