Congress can come up with laws, and send them to the president for approval. If it is vetoed, there are ways that Congress can override that. That is how they share responsibilities, I hope this helps.
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Greek city-states developed different forms of governance with very different political structures and strengths.
Greek colonization led to the spread of the Greek language and Greek culture, but it also resulted in tensions with the neighboring Persian empire, culminating in the Persian Wars.
Athens developed democratic institutions and a culture of philosophy, science, and culture; it emerged as a powerful state and allied with other city-states, forming the Delian League.
Resistance to Athens’ power among the other Greek city-states, particularly Sparta, prompted the Peloponnesian War.
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