The labelling rule will effectively end preferential treatment of Hong Kong by the United States in response to a National Security Law imposed by Beijing in the territory which critics say has eroded the rights and freedoms of Hong Kong citizens and killed off semi-autonomous operations.
Hong Kong's new national security law was gazetted into an annex of its Basic Law on June 30, the eve of the 23rd anniversary of the former British colony's handover to China.
The law targets secession, subversion, terrorism and collusion with foreign forces.
Trump had issued an executive order in June declaring Hong Kong no longer sufficiently autonomous from the mainland after Beijing launched a crackdown against democracy supporters.
From Tuesday, goods made in the city will be subject to the same trade war tariffs levied on mainland Chinese companies, which necessitates the new labelling, according to the South China Morning Post (SCMP).
The formerly favoured treatment toward Hong Kong's trade-exports industry was part of a 1992 Hong Kong policy act which allowed the US to continue to have separate trade deals with Hong Kong and mainland China after Hong Kong returned to Chinese control.
In May, finance chief Paul Chan said the new labelling would have little impact, as exports from Hong Kong to the US account for only 0.1 per cent of total exports. - dpa
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