Emigration offered prosperity for Scots.
Land was plentiful. In the American West and Canada land was offered on a loan basis. This attracted experienced farmers and labourers.
In Australia and New Zealand, cattle and sheep farming was a prosperous industry, so the possibility to make your fortune attracted many.
Discovery of gold led to gold rushes:
New settlements needed new infrastructure, road networks, administration centres, schools and churches - this created much employment. Wages were higher in the New World and living conditions were much improved.