UNITED NATIONS, Jan. 16 - Brushing aside proposals to end the seven-week-old strike that has crippled his country's economy, President Hugo Chávez of Venezuela said tonight that he was fully confident he would vanquish the opponents demanding his resignation. "I don't have the slightest doubt of our triumph," Mr. Chávez said in an interview. "We are winning this battle and we are going to win it!" One day after the announcement of a new mediation effort by the United States and five other nations, Mr. Chávez also raised doubts about that initiative. He said Venezuela would insist on the participation...