because they felt like it
because it was easy for them to travel. C'mon people
By boat.
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Yes, America is a free country. Americans can travel to Russia. the flight would be long, but they can if they would like to visit Russia.
Not as long as they are traveling from America.
When you travel west from North America, you would come to the continent of Asia, specifically reaching the eastern parts of Asia, such as the islands of Japan or the coasts of China, depending on your precise starting point. If you continue westward across the Pacific Ocean, you would eventually reach countries like Japan or the eastern coast of Russia.
Marco Polo did not travel to America and did not meet Native Americans; he travelled to China and met the Chinese.
If you traveled from Argentina to Alaska, you would primarily head north. Starting in Argentina, you would move through various countries in South America, then continue north through Central America and into North America, eventually reaching Alaska. The journey would involve traversing diverse terrains and climates as you move from the southern hemisphere to the northern hemisphere.
The Americans got the idea of using horses for hunting, traveling, etc. after the Spanish invaded America. The Spanish inspired the Americans to use the horses in the ways listed above. America found a quick way to travel, or transport things when horses came into use in America.
Yes, Americans can travel to Australia.
Yes, Americans can travel to Israel.
Yes, Americans can travel to the UK.