Final answer:
The gold standard for currencies fell apart due to countries' inability to maintain the fixed exchange rate with gold. It is unlikely to make a comeback due to the complexities of the modern global economy.
Step-by-step explanation:
The gold standard for currencies fell apart due to various factors. One significant factor was the inability of countries to maintain the fixed exchange rate between their currency and gold. As countries exchanged their dollars for gold, the demand for gold increased, leading to an increase in its price. This made backing the US dollar by gold more expensive and unsustainable. President Nixon's decision to abandon the gold standard in 1971 further destabilized the system.
It is unlikely that the gold standard will make a comeback in the future. The global economy has become more complex and interconnected, with currencies being influenced by various factors such as international trade, monetary policies, and market forces. A return to the gold standard would restrict the flexibility of countries to respond to economic crises and would not adequately address the challenges of a modern, globalized economy.