Bigday
Most people here in the U.S. are at best vaguely aware of it. The majority are more concerned about the government shutdown and the Mueller investigation plus the recent elections.
I don't think most people who voted for Trump really care about the Wall being built either way ( it is already partially finished in places ).
They do care about the shutdown, the impasse between Democrats and Republicans over what is a trivial amount in terms of the total federal budget and its impact on people and it increasingly becoming a threat to national security.
It's one thing to project and theorize about the UK leaving the EU when it is a long way off, it's another when you see a no-deal exit becoming a reality.
I am reminded of the people of Phnom Penh who welcomed with joy the Khmer Rouge because they were tired of what they perceived as a corrupt government filled with corrupt generals and they thought the Khmer Rouge would be a welcomed change. Boy were they in for a surprise!
There are certain parallels between the hardest brexiteers and the policies of the Khmer Rouge government. These include a belief in absolute self-sufficiency, even in the supply of medicine and a racist emphasis on national purity, a focus on perceived common sense over technical knowledge ( the ignoring and ridiculing of industry leaders who warn of great danger and difficulties in a no-deal brexit ).
Radical change does not always result in something better than what you currently have.