US President Donald Trump had announced before taking office a USD 50 billion deal with SoftBank which he said would generate 50,000 jobs.
Trump was speaking last month alongside SoftBank's chief executive Masayoshi Son, who displayed a document which indicated Softbank and Foxconn would "commit to invest USD 50bn + USD 7bn in US, generate 50k + 50k new jobs in US in next four years".
Foxconn, a major supplier to Apple, had earlier said it was in "preliminary discussions" with US officials about a potential investment but gave no details.
The firm is the world's largest contract electronics maker and is best-known for assembling products for international brands such as Apple and Sony.
More From This Section
"Pennsylvania is active and I urge other states to act more quickly or I will sign the contract with Pennsylvania," he said, adding that the investment could create 30,000-50,000 jobs.
Foxconn is still waiting to see the tax policies of the new US government and what incentives state authorities can offer, such as cheap land and electricity, Gou added.
Last year it took over the struggling Japanese electronics maker Sharp after acquiring a 66 percent stake for USD 3.7 billion in a move Gou described as "really worth it."
In the US, it has a plant in Virginia for packaging and engineering which employes over 400 people. It has also announced a USD 40 million investment in a facility in Pennsylvania to build precision tools and develop a robotics programme.
Gou said Foxconn aims to increase investment in China this year to try to boost Sharp's market share in the country, but denied reports that he had been pressured by China over his planned US investment.