写这段的paraphraseThen the trickle of immigrants became a stream

写这段的paraphrase
Then the trickle of immigrants became a stream,and the population began to move westward—not to grab and leave but to settle and live,they thought.The newcomers were of peasant stock and they had their roots in a Europe where they had been landless,for the possession of land was the requirement and the proof of a higher social class than they had known.In America they found beautiful and boundless land for the taking—and they took it.