Who was the ruler of akkad who established the first empire in sumer ca. 2340 b. c.e?

During the era of european expansion, what was the biggest reason for spain’s push for exploration?

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?

What change took place in the african slave trade in the 1500's?