I think its the executive. But it may be all of them because they balance each other out, no one is higher or lower
Do you have any answer choices ?
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The role of the President pro tempore of the Senate is mostly ceremonial as he is appointed to work in the place of a vice president when he is not available and take everything in control.
Mostly the power is in the hands of the other leaders and the senators but in the absence of the vice president the President pro tempore of the senate takes his place and certain duties are authorised which he can perform during that time.
The leader back then Was Called A dictator but back them it was selected by the people.
The reason it is impractical is they traders had to go around South America... For example, say New York is sending trade ships to San Francisco. They would go all the way down to the bottom of South America and then all they way back up. By creating the panama canal, it allowed ships to cut through the land and make the route more practical.