Financial stress is not exactly the condition correlating with the creation of new taxes. A tax does not relieve financial stress in any general way. If it did

Financial stress is not exactly the condition correlating with the creation of new taxes. A tax does not relieve financial stress in any general way. If it did, we would constantly raise taxes. What a tax does is enforce a collective use of financial resources. The demand for such enforced collectivism increases when a threat emerges that can only be adequately dealt with using such collective action. A foreign nation, engaged in organized violence, aka war, against a nation, is the most extreme example of a situation where enforcing collective action provides a benefit to the majority, and thus that's when people are most likely to sacrifice their liberty and accept a new tax.