The gold dollar was about to put a check on Lyndon Johnson's 'Great Society' crapola, but Nixon defaulted on the gold dollar, crossed the words 'I owe you' from 'I owe you X dollars' from the bank notes and called the little paper previously known as the 'Federal reserve note' into 'dollars'. This is what allowed the government to perpetuate its growth to the gargantuan size it is today and it is what killed USA economy reversing the economic growth in USA and eventually wiping out the economy completely.
As to statistics, some people compile this data, of-course unemployment rate shows some of this but the details of unemployment are much more important than the compiled averages, the poorer segment of society, the black Americans have suffered higher unemployment rate since the programs against poverty started, than ever before. Actually before the minimum wage was introduced in the 1938, unemployment among blacks youth (16-25, formative work years) was lower than among whites by 15%. Actually each 10% increase in minimum wage mandate had a disproportionate decrease in employment upon the minorities, which is counterproductive if the goal is to decrease poverty, of-course it was not, the goal was to turn people into dependants, voting for bigger and bigger government, while growing the said government.
The gold dollar was not allowing the government to carry with that goal and Nixon chose to default on the actual dollar than to abandon big government ideology.