What group conquered constantinople in 1453 ce, ending byzantine rule? avars mercenaries ottoman turks venetians sassanids

Which of these did the soviet union do in 1961? it built a wall through berlin to keep people from moving to the west. it used force to destroy a wall the united states had built in berlin. it convinced the british and french to merge their zones in berlin with the soviet zone. it threatened to bomb berlin if the united states did not leave within 30 days.

What was a major failing of the united states government under the articles of confederation?

In the united state, a system for interaction between unmarried men and woman that casual dating with the purpose of marriage was called