The US poverty rate decline has never been as fast as it was just prior to the beginning of socialist programs and the war on poverty, which promptly resulted in a plateau of the poverty rate.
Fallacy Of False Cause
1) This is factual untrue. The Great Society/War on Poverty Programs Began in 1964 and poverty declined sharply between 1964-1974 (https://en.wikipedia.org/wiki/Poverty_in_the_United_States#/media/File:Number_in_Poverty_and_Poverty_Rate_1959_to_2011._United_States..PNG).
2) There were any number of similar wealth transfer ("Socialist" in the common parlance) programs implemented before this period such as Social Security that researchers believe had enormous impacts on poverty in the U.S. (GV Engelhardt, J Gruber, 2004 - NBER). So the cutoff suggested in this premise is totally arbitrary and quite misleading.
3) Even if every facet of this premise were factually correct, it would still only prove a correlation, not causality.
Socialism is the destruction of price information to OBSCURE the valuelessness of these workers to the consumer - so that they cannot make an informed decision of whether to pay the wage of the worker - it has not solved anything it has just forced the consumer to subsidize the valueless worker.
You must present evidence that socialism has "never solved anything" and moreover, the purpose of Socialism is certainly not to destroy valuable pricing information towards a purposeful effort of inefficiency. You might argue those are side effects of the system. The language of this premise is prejudicial and not constructive in furthering discussion on this topic.