Why do we use commas after transition words? Commas make the sentence look nicer.
Commas indicate a natural pause in the sentence.
Commas show readers when something should be shouted.
Commas are extra punctuation.

Commas indicate a natural pause in the sentence.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.

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hope this