As part of a drive to build Washington's influence across the region and to counter Beijing's growing clout, Blinken touched down in the capital Nuku'alofa on a diplomatic charm offensive.
"We're a Pacific nation", and "we very much see the future in the Indo-Pacific region", Blinken told his hosts.
"We really understand what is a priority for the people here," he added, citing issues like climate change, development and illegal fishing.
Blinken also delivered a barbed warning about aid and investment from Beijing, saying it often comes with strings attached.
"As China's engagement in the region has grown, there has been some -- from our perspective -- increasingly problematic behaviour," Blinken said.
He claimed China had been behind "some predatory economic activities, and also investments that are done in a way that can actually undermine good governance and promote corruption".
Earlier this year, Micronesia's then-leader David Panuelo publicly accused China of engaging in harassment and espionage, and bribing members of his cabinet.
Tonga's debt-laden government is seen as particularly vulnerable to economic pressure from China.
The island kingdom owes China's export bank around $130 million -- almost a third of its GDP -- which was loaned to help rebuild after rioters tore through the capital in 2006.
Repayments on that loan are scheduled to spike next year.
- Diplomatic hub -
Tonga, a Polynesian archipelago of about 100,000 people, is the latest in a string of Pacific island states being targeted in a renewed US diplomatic push.
The new US embassy in Nuku'alofa was officially opened in May, but Blinken's hosts said his visit signalled Washington's renewed interest in the region.
"His presence here today is a testament to the fact that our partnership is growing from strength to strength," said Tongan Prime Minister Hu'akavemeiliku Siaosi Sovaleni, welcoming a "shared respect for democracy, rule of law and the rights and freedoms of others".
The United States has plans to open embassies in Vanuatu and Kiribati, and in February restored its embassy in Solomon Islands after a 30-year hiatus.
"The United States had been missing in action to some extent prior to 2018, but they are now back in a big way," said Pacific analyst Meg Keen from Australia's Lowy Institute.
"Where they have singled out for visits is where they think the geopolitical risks are high," she told AFP.
Chinese state-controlled media painted Blinken's visit as evidence that the United States no longer had confidence in its ally Australia to manage relations with Pacific Island nations.
The United States has been the dominant military force in the South Pacific since World War II.
But the region is increasingly an arena for powers to compete for commercial, political and military influence.
China, the rising military force in the region, has also asserted itself through its expanding diplomatic reach, investment, police training and security deals.
While in Tonga, Blinken also commented on the abrupt removal of Chinese foreign minister Qin Gang from office.
"I wish him well," Blinken said, while vowing to work with his replacement Wang Yi.
"I've also known Wang Yi for more than a decade. I've met with him repeatedly," Blinken said. "I anticipate being able to work well with him as we have in the past."
"It is important for us to manage this relationship responsibly. That starts with diplomacy, that starts with engaging, and I will work with whoever the relevant Chinese counterpart is."
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