As Washington tries to rebuild its strained relationships in Latin America, China is stepping in vigorously, offering countries across the region large amounts of money while they struggle with sharply slowing economies, a plunge in commodity prices and restricted access to credit.

In recent weeks, China has been negotiating deals to double a development fund in Venezuela to $12 billion, lend Ecuador at least $1 billion to build a hydroelectric plant, provide Argentina with access to more than $10 billion in Chinese currency and lend Brazil’s national oil company $10 billion. The deals largely focus on China locking in natural resources like oil for years to come.

China’s trade with Latin America has grown quickly this decade, making it the region’s second largest trading partner after the United States. But the size and scope of these loans point to a deeper engagement with Latin America at a time when the Obama administration is starting to address the erosion of Washington’s influence in the hemisphere.

“This is how the balance of power shifts quietly during times of crisis,” said David Rothkopf, a former Commerce Department official in the Clinton administration. “The loans are an example of the checkbook power in the world moving to new places, with the Chinese becoming more active.”