Europeans began establishing colonies in north america. what year did this happen?

It happened in 1607.

Explanation:

The first colony was established at Jamestown, Virginia, in 1607. A lot of people settled in the New World escaping religious persecution. The Pilgrims arrived in 1620. and founded Plymouth, Massachusetts. In both Virginia and Massachusetts, the colonists had some kind of, we could say support from Native Americans.        

European Nations established colonies in North America because they wanted to expand their horizons (main reasons were the gold, glory, and spreading their religion). They also wanted to have more land than other countries.

The Spanish were among the first Europeans to explore the New World and the first to settle in what is now the United States.

By 1650, England had established a dominant presence on the Atlantic coast. They discovered corn which kept them from starving while, in Virginia, tobacco was a great way to make money. In early 1700s enslaved Africans contributed a growing percentage of the colonial population. By 1770, more than 2.000.000 people lived and worked in Great Britain's 13 North American colonies.

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ef0: daños leves. algunas tejas caídas y otras pequeñas piezas de los tejados arrancadas, algunos daños en canaletas, ramas de árboles rotas y algunos árboles poco profundos arrancados. los tornados que no causan daños visibles (por ejemplo aquellos que se producen en campos abiertos) se valoran siempre como de ef0.

ef1: daños moderados. tejados seriamente despedazados, caravanas y casetas volcadas o seriamente dañadas, perdida de puertas exteriores y ventanas y otros cristales rotos.

ef5: daños increíbles. las casas fuertes pueden quedar arrasadas hasta los cimientos, las estructuras de hormigón armado dañadas críticamente, los edificios altos sufren graves deformaciones estructurales. devastaciones increíbles.

y según esto creo que puedes sacar tus conclusiones. y la verdad la escala ef10 si no se decirte por que no la eh visto o mejor dicho estudiado. espero que te sirva. suerte.