Final answer:
The likely effect of U.S. sugar trade agreements falling through is a decrease in sugar prices and a surge in sugar imports.
Step-by-step explanation:
The likely effect of U.S. sugar trade agreements falling through is a decrease in sugar prices and a surge in sugar imports. When trade agreements collapse, it becomes more difficult and costly for the United States to import sugar from other countries. As a result, the supply of sugar within the country decreases, leading to higher prices. To compensate for this, the domestic market may turn to importing more sugar from other countries.