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Belgium, France, Italy, and Sweden are all European countries that are part of the European Union or EU. Being a member of the EU grants access to a large single market with fewer trade barriers. This makes it easier for these countries to trade with neighboring countries and increase their export to GDP ratio. The United States is bordered by only two countries, Canada and Mexico, which means that it has fewer immediate trading partners within close proximity.

The United States is the third largest country in the world in terms of land area, and has abundant natural resources. This means that the US has a greater capacity to produce products and services within its own borders, relying less on imports. On the other hand, Belgium, France, Italy, and Sweden are relatively smaller countries with more limited resources, which could explain their higher dependence on international trade and thus their higher export to GDP ratios.

The structure of a country's economy also plays a role in determining its export to GDP ratio. For example, the United States has a highly diversified economy, with strengths in various sectors such as technology, finance, and services. This means that a large portion of its GDP is generated from these industries, which might not rely as heavily on exports. In contrast, Belgium, France, Italy, and Sweden have more specialized industries such as manufacturing, pharmaceuticals, and luxury goods, which are more export-oriented. This higher dependency on exports for economic growth results in a higher export to GDP ratio for these countries.

Exchange rates can also play a role in determining a country's export to GDP ratio. A weaker domestic currency makes a country's exports more competitive on the international market, which can lead to an increase in the export to GDP ratio. The United States has a strong currency (the US Dollar), which can sometimes make its exports more expensive relative to its European counterparts using the Euro or other currencies. This may result in comparatively lower export volumes for the US, contributing to a lower export to GDP ratio. Overall, the reasons behind Belgium, France, Italy, and Sweden having a higher export to GDP ratio than the United States can be attributed to factors such as location and market accessibility, size and resource endowments, industry structure, and exchange rates. These factors influence the extent to which a country relies on international trade, and in turn, its export to GDP ratio.