"We must move the clouds and allow the sunshine in," Webb said, and added: "The 2026 World Cup belongs to CONCACAF."
Blatter hailed Webb's election on the world body's executive committee.
"The credibility of CONCACAF is back," Blatter told delegates. "We also in FIFA need credibility, but we cannot have it if one of our confederations was still a little bit shaky."
CONCACAF officials shone a harsh light on its accounts which have been analyzed since March by consultants BDO.
"Material weaknesses and significant deficiencies" in financial controls through 2010 were revealed and the body also had "potential tax liabilities" in excess of its $2 million allocated reserves, delegates were told.
Webb said CONCACAF members would be called to an extraordinary congress at the end of the year when the body's financial and tax affairs will be further scrutinized.
CONCACAF's $1 million rental offices in the Trump Tower on Fifth Avenue will be reviewed.
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