Answer:
what is your language I don't know what do you say
Gold rush was the biggest reason why people of Europe came to USA. Firstly, the conditions in Europe were bad in the XIX's century. So with the gold rush, the Europeans came to USA to try their self in it. So there is the first consequence: It was a goal that almost immigrants 'd like to find.
Then, the second one is that the migrants lost all their money. So the gold rush wasn't what they expected : Instead of making them rich, it made them poorest than they were.
Hope it helps
The answer is B) Federal Highway act
The best option would be that the period of unrest in Europe after 1815 was caused by "<span>a. opposing ideologies," since most of the revolutions taking place during this time were fights for democracy. </span>
Leonardo da Vinci contributed to the inventions/ideas would be the Parachute and Flying Machine.