I'm uncertain if Donald Trump is consciously moving the US into austericy but so far MANY of his executive orders will have that result.
The UK has been in austericy for 25 years now and if there is one thing I have learnt, it's that if something lasts for long enough. it becomes 'the new normal'. The people adapt to the idea that simply keeping a roof over their heads, paying utilitty bills and the bare minimum in the way of food, clothing and so on is all that they will achieve and that they should be greatful for that.
Because a people who have to spend their entire time simply surviving are unlikely to question authority.
As I have said, study the history of US tarriffs. Study the social structure of ancient Rome - because that is quite clearly the model Donald Trump envisages. A small elite who freed from oversight are then free to exploit the people.
I'm not an expert on the US system of government but it was my understanding that the role of the two houses are the ones to enact and repeal laws, the role of the president is to oversee the enation of those laws. So if the US system of government is so flawed that a president can simply enact exacutive orders, how does that differ from ancient Rome? If a single person holds imperator, it's a dictatorship by any other name. People may especially wish to study the period 100BC to 50AD. Because for quite a while the senate still theoretically held sway but the emperor was in a position to aid their money-making or equally to take away their wealth or in some cases simply have them charged for some invented crime. Carrot and stick.
I suppose modern Russia is the most similar example I can think of. It's really worth reading how Putin got into power and how he turned a democratic nation into a kleptocracy where he demonstrated imperator in the most demonstrable manner - he had people murdered.
Nation states do not move from democracy to dictatorship instantly. It's a generational thing where, as mentioned above, when people grow up into such a system, to them it is normal.