Who took over Alexander's Egypt? -How long would his dynasty last?

The Battle of Ipsus (301 BCE)  -  332–323 BC

Explanation:

After the death of Cassander and Lysimachus, following one another in fairly rapid succession, the Ptolemies and Seleucids controlled the vast majority of Alexander's former empire, with a much smaller segment controlled by the Antigonid dynasty until the 1st century. To Ptolemy went Egypt. His dynasty was to last until the su1cide of Cleopatra VII in 30 BC. Macedonia itself went to the feeble-minded half-brother of Alexander, Philip III, against a background of civil war. Macedonia was conquered by the Romans in 197 BC.

nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.