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Argentina's lower house of Congress approves taxes on agricultural exports, which farmers have vowed to resist.

White House hopeful John McCain urges approval of a US free trade deal with Colombia as he tours the country.

The economic angst that is gripping the US in election year

South American heads of state end a regional summit with a fierce attack on the "barbarism" of EU immigration policies.

Americans gave a record $306bn to charity in 2007 but fundraisers say economic woes may hit future giving.

Farmers in Argentina lift most of the roadblocks they set up during a three-month row with the government.

President Bush asks the US Congress to end a ban on offshore oil drilling, as fuel prices rise up the political agenda.

Argentine farmers announce their fourth strike in as many months to protest against tax increases on food exports.

Restaurants and supermarkets in the US stop selling certain types of tomatoes after a salmonella outbreak.

The Argentine leader defends a decision to impose a higher grain tax which has led to months of protests.