You appear to be asserting that California and Iowa disagreeing about stuff is sufficient by itself to say the US is engaged in undemocratic behaviour.
Yes, which is why we have two houses in the legislature and there are limits on the number of seats in the house and electoral college votes. No polity should be able to procreate their way to political dominance over a peer polity nor should they be able to incentivize law breaking for the same purpose.
And more on point to the subject, imports should be tariffed so that there are not wage benefits to importing products from overseas. It's major bullshit for a country to say "you must have all these employment standards, safety, wage, retirement, health, holidays, etc." for any business in their area and then go and buy competing goods from outside their area with completely different labor standards.
Because the french agreed to those terms when they entered the European Union, that they would negotiate their trade deals together, and a qualified majority is sufficient to make these deals.
They're also free to leave at any time.
"Destroying the agricultural sector" is stupid hyperbole, especially given the small quotas in sensitive parts of the agricultural sector.