 Complete the following phrase:  The agricultural revolution changed the traditional system of agriculture which had existed in Lowland Scotland. Thousands of cottars and tet farmers migrated from farms and smallholdings to the new industrial centres of Glasgow, Edinburgh and northern England. Particularly after the end of the boom created by the Revolutionary and Napoleonic Wars 17901815, Highland landlords needed cash to maintain their position in London society. Whereas rents had often been paid in kind, the landlords turned to money rents. They evicted the farmers who had occupied run rig arable land and shared grazing. Their holdings were let to large scale sheep farmers, who could afford substantially higher rents. The eviction of tets went against , the principle that clan members had an inalienable right to rent land in the clan territory. Particularly in the north and west Highlands, estates offered alternative accommodation in newly established crofting communities, with the intention that the resettled tets worked in fishing or the kelp industry. These evictions were the first phase of the Highland Clearances. The total population of the Highlands continued to rise throughout the clearances. The result was a continuous exodus from the landto the cities, and further afield to England, Canada, America and Australia. The 