Theodore Judah was an engineer who O built the first railroad in the United States.
O owned and ran a large shipping company.
O began the Union Pacific Railroad.
O helped start the Central Pacific Railroad.

Built the first railroad

Explanation:

was a central figure in the original promotion, establishment, and design of the First Transcontinental Railroad. He found investors for what became the Central Pacific Railroad.

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

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ghana achieved independence peacefully, while algeria gained independence through an armed struggle.