with the ROC, and thus keeping the ROC's development assistance and access to the ROC's markets, would be more advantageous for Paraguay. United States The ROC and the US signed a formal treaty of commerce and navigation in 1948. ROC passport holders can thus be granted an E1 and E2 Visa, with indefinite renewal status, based on continued operation of their enterprise in the US. In 1979 the US recognised the PRC instead of ROC. Commercial (such as Trade and Investment Framework Agreement signed in 1994, TIFA), cultural and other substantial relations are currently governed, inter alia, by the 1979 Taiwan Relations Act. The Act does not recognise the terminology of "Republic of China". United States policy does not support or oppose Taiwan's independence; instead US policy takes a neutral position of “non-support” for Taiwan's independence. US Deputy Assistant Secretary of State Alex Wong officially visited the ROC in March 2018 to protest the amendment of the PRC Constitution that removed Presidential tenure restrictions. In July 2002, Minister of Justice Chen Ding-nan became the first Taiwanese government official to be invited to visit the White House after the switch. While the US acknowledged PRC's One China Policy in 1979, it did not accept the PRC's claim on Taiwan. The unofficial name "Taiwan" was mentioned in the Three Communiqués between the United States and China. Consistent with the United States' One China policy, raising the ROC flag on an official government facility's property within US territory is not approved by the US. Taiwanese passport holders are included in the US Visa Waiver Program for a stay of 90 days. After 1979, the US-Taiwan Business Council continued to facilitate commercial activity (mostly semiconductor technology related) and arms sales service. The United States House of Representatives added an amendment to the fiscal year 2016 US defense budget that includes a clause urging the ROC's participation in the biennial Rim of the Pacific (RIMPAC) exercise. The United States State Department has close bilateral cooperation with the ROC through Bureau of Educational and Cultural Affairs' Fulbright Program. Recent disputes between the US and the ROC include the ROC's ban on the import of US beef and US pork, which was resolved after the ROC adopted the new standard of a maximum residue limit for ractopamine in both beef and pork. In 2007, a measure was introduced into the United States Congress that would dramatically strengthen