Data on state exports are from the U.S. Department of Commerce; specifically, from https://usatrade.census.gov , which provides details on U.S. merchandise exports by state.
Data on U.S. exports currently subjected to foreign tariffs comes from official sources of the governments of the EU and China (steel and aluminum , Sec. 301 , $16 billion finalized list of Chinese tariffs , which replaces the preliminary tariff list shown in Part B of the China Section 301 tariff source document, and the most recent round of additional Chinese tariff lists, which can be accessed here, segmented by tariff percentage.)
The three tiers of damage are based on the percentage of a state's total exports (rounded to the nearest percent) to the EU and China in 2017 that are subject to retaliatory tariffs. The breakdown is as follows:
- Significant Damage: Less than 10% of a state's total exports to the EU and China are threatened by retaliatory tariffs.
- Very Significant Damage: 10%-25% of a state's total exports to the EU and China are threatened by retaliatory tariffs.
- Extremely Significant Damage: More than 25% of a state's total exports to the EU and China are threatened by retaliatory tariffs.
This website is based solely on these official sources of information. In some cases, imprecision may arise because some imports are re-exported or because one state's products may be exported through another (e.g., a border state).