Why the American system provides more divided government than the parliamentary system is because the Executives and Legislature are each elected separately.
Under a parliamentary system, a Decorated Monarch acts as Head of states and the Legislative provides the law through majority votes.
The officers of parliamentary system is not as expansive as the Federal Democratic government practiced today.
Basically, the Federal system is one where the there are 3 branch of government both at the Federal level, State Level and the Local Level.
Therefore, the reason why the american system of government produces more divided government than the parliamentary system is because it is stated by the US constitution that the various level of government should be elected except the Judiciary.
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