You've got it the wrong way around... Checks and balances is something the US stayed true to, we have tended to overlook most of them. Separation of powers, for example, is basically non-existent in much of Europe. For example, our Storting(your congress) has absolute power over both the executive and the supreme court. It also consists of just one chamber, so no senate and house of representatives.
Dissolving parliament is a practice that differs from country to country. The reason for doing it also differs. Usually it's due to a vote of no confidence from the legislative on the executive.
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