What attracted immigrants from Europe to North America? Why did the number

What attracted immigrants from Europe to North America? Why did the number of immigrants increase significantly after the US gained independence?

In fact, there were several reasons at once. I will try to summarize the most basic ones. The most important thing was that there was large and undeveloped land. Also, many people were attracted to North America because they wanted to hide from the persecution of the church. Many fled there in search of a better life, to start all over again, to live a little richer, well, or not in poverty. But when the United States won independence, the flow of people increased, because there was freedom of speech and religion. Also, the US economy developed at a rapid pace.