Why was ostracism practiced in ancient Athens? to allow officials to decide on laws
to allow immigrants to become citizens
to force people to participate on a jury
to remove people who were too powerful

To remove people who were too powerful

Explanation:

Ostacism was practiced by writing the name of the government offical that you wanted to cast out of Athens for 10 years. To other government officals, this was also an effecient way for getting rid of potential opponents.

to extend a country’s power and influence

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.