Ferdinand Magellan,
but he died halfway through.
Progressive reformers targeted voting fraud.
I believe the answer is: It delayed or extended nationalist struggles.
The nationalist struggles come after different nations started to fully embodied nationalist movement, which make them tend to incline to prove their nation's superiority over another nations. This type of thinking often lead to conflicts among these european nations.
It allowed the Union to shoot down the confederates from atop the hill.
