That speedy planting in diverse fit places is most necessary upon these lucky western discoveries for fear of the danger of being prevented by other nations which have the like intentions, with the order thereof and other reasons therewithal alleged.
This reminds me of the Columbian exchange and how with the addition of new plants and animals brought from the Old World, it also came with diseases and new definitions of unsanitary. This was about 100 years after Columbus' first expedition, so this isn't a novel idea about taking the old into the new. Even if he's not specifically talking about plants and is referring to social roots as opposed to physical materials, his statement is nonetheless true. The cultures colliding, already knowing that people inhabit the land, will be a point of contention for the British as they continue to explore America. The British would be spreading their beliefs and culture across the land while the Indigenous population would have to learn to assimilate (or vehemently oppose) to this new way of living.