That's what I said. When I speak of expansion I don't speak of the State but of all the indicators, I speak of intelligence, knowledge, territorial expansion, technology, etc. It was exactly when they stopped expanding in these areas, because they were comfortable, and began to expand their State, through forms of subsidies and Welfare State, with the "bread and circuses" in Rome, which began to fall.
Rome gave subsidies to wheat and organized expensive entertainment events to benefit the population, however, this growth of the State brought with it the collapse of civilization, interregional trade was diminished because farmers could not compete with subsidized wheat, and many poor people emigrated to the Roman center to live with these facilities. The Roman economy suffered an atrocious interventionism and the population became accustomed to luxuries, which is why they could not stand with the same barbarians they had subjugated for centuries.
I think something similar can happen with the implementation of a universal basic income.