International trade, they are one of the biggest trade countries in the world so that makes sense:)
<span>Leonardo would have been exposed to both theoretical training and a vast range of technical skills including drafting, chemistry, metallurgy, metal working, plaster casting, leather working, mechanics and carpentry as well as the artistic skills of drawing, painting, sculpting and modelling</span>
It showed how strong North Vietnam was and it's potential of how threatening they were.
The answer to your question is 1962
Very fertile farmland was being sold very cheaply and the Gold rush was just beginning