It has done this because when they have to extend a train track or the road they have to get rid of a forest that is growing just because they want more people to get around and travel. Also they have to do this because imagine of you are just driving through a forest and then a tree is leaning and then it gets in the way of the road when it falls.
Answer:
Invasive species, including communicable diseases, were a byproduct of the exchange. The changes in agriculture significantly altered global populations. The most significant immediate impact of the Columbian exchange was the cultural exchanges and the transfer of people (both free and enslaved) between continents.
Explanation:
Napoleon had invaded Spain proving how weak it was, leading country's to revolt after years of discontent.
