Which cities in Arabia became part of the Islamic Empire by the death of Abu Bakr (634)

We can mention some of the important cities, such as Mecca, Medina, Shabwa, Sohar and Aden.

Explanation:

Until 634 Muslim Empire was spreading only in the region of Arabian Peninsula. It included the reign of Muhammed and his direct successor Abu Bakr. Of course, it was impossible to create a larger empire at that moment as the country was just created.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories