Porquè los tròpicos son las zonas de mayor biodiversidad

What is the main reason the united states removed the taliban from power shortly after the september 11 2001 attacks ?

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

Once the constitution was approved, what more had to happen before it could go into effect?