Theodore Judah was the person who convinced the railroad officials that it was possible to build a railroad line across line across the Sierra Nevada Mountains.He is also considered as the "Father of first Transcontinental Railroads.Judah had many opportunities that the people prior to him did not have.
The principle of Yin and Yang is that all things exist as inseparable and contradictory opposites, for example, female-male, dark-light and old-young. The principle, dating from the 3rd century BCE or even earlier, is a fundamental concept in Chinese philosophy and culture in general.
You are correct! "<span>A cease-fire agreement created a demilitarized zone along the 38th parallel." is the correct </span>answer.