Final answer:
Samuel de Champlain and Jacques Cartier were the two men who explored and opened up the Canadian Shield for development, with Champlain founding Quebec and Cartier establishing Charlesbourg-Royal.
Step-by-step explanation:
The two men who were instrumental in exploring, mapping, and opening up the area of the Canadian Shield for settlement and development were Samuel de Champlain and Jacques Cartier. Samuel de Champlain, known as the 'Father of New France,' established the first permanent French settlement in North America at Quebec in 1608, which became the center of the fur trade and French expansion in the region. Jacques Cartier, in his voyages beginning in 1534, claimed the Gulf of Saint Lawrence and later established Charlesbourg-Royal, aiding in the French realization of the potential for colonization and trade in the area.
The exploration and development by these two men highlighted the interest of local Indigenous people, like the leader of Stadacona, in controlling trade networks, and marked a significant period in the history of Canadian exploration and settlement.