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I would say that in very fast moving water such as in a river, the cobble size could be transported because cobbles are 64-256mm so are quite big and in a quiescent stream won't move much but in a freshet say in a steep mountain stream they can be rolled along such as I observed in the local streams at a mining town during the Hurricane Fifi in Honduras in 1974.
In addition to a desire for economic profit, nationalism also served as a reason for colonization. After the French Revolution, European nations had a strong sense of national pride, and felt that in order to prove themselves as a strong world power, they would need to gain control of other countries.
