Answer:
He wants Zaroff to feel like he's being hunted. Rainsford has now tracked him down and his him on an even playing field. Zaroff is now the one who has to fight to stay alive. Aside from this, I think an ambush would be pretty difficult. Rainsford is unarmed and Zaroff is tucked away somewhere in his great chateau. A sneak attack probably wouldn't be successful.
Manifest Destiny. beleif held in 19th century by many Americans that U.S. was destined to (meant to) span from Atlantic Ocean to Pacific Ocean, spreading its culture and democracy; belief had political, economic, and social roots:growth in U.S. economy increased demand for (and value of) farmland, ranches, and furs; the cotton gin increased the area in which cotton could be grown profitably; the discovery of gold in California attracted 80,000 people in1849
Francisco franko was a military dictator in Spain in 1939
The 2nd Amendment which states the right to bear arms.