Final answer:
Sweden is among the most open trading partners of the U.S. based on its high level of trade and favorable attitude towards globalization, unlike the comparatively lower trade levels of larger economies like the United States and Japan.
Step-by-step explanation:
Among the trading partners of the United States, countries like Sweden are considered to be highly open to trade. This is indicated by the ratio of the country's exports to its GDP, which is a common measure of trade openness. Sweden, due to its size, numerous nearby trading partners, and extensive history of foreign trade, contrasts with large economies like the United States and Japan, which have comparatively lower levels of trade. The statistics showing Americans' attitudes towards trade expansion also reflect this, with the United States having the least favorable attitude towards growing trade ties according to a global survey.
Considering these perspectives, it becomes evident that being open to trade is not solely determined by the size of an economy but also by the country's trade policy, history, and its citizens' attitudes toward globalization.