The Spanish monarchy controlled Portugal from 1580-1640 so in a sense yes they were.
Well most cars have a steering wheel, gearshift, accelerator and breaks. So anyone able to drive a car has a basis to learn how to drive military vehicles driving exams or no.
I would note that all the listed examples are "invaders". There simply exists no other recourse for the mentioned nations to start projecting influence other than by first creating a foothold. The Wales/England thing works on a similar baseline just in a much smaller scale. It's just that for medieaval England the land route to Wales was equally difficult to cross as the oceasn for the 1700s nations.
Exactly. I wouldn't go so far as to say they eschewed land war. It just wasn't an option nor need at the time. We are in a period in the 1500s-1700s when it's enough for most nations to control generation of wealth and that happens primarily through trade. Few places are so naturally endowed they can sit on important land routes and dominate them. E.g. India was domestically powerful enough to resits the invaders until they focused resources and efforts and using the various factions managed to extend influence. It's not really until the 1800s that controlling territory and populations in itself becomes the goal and we see the mad scramble for colonies.
In North America the situation existed with a sort of power vacuum into which colonists moved eventually starting to claim territory. In South America similarly the Spanish found they had the means to control the land and the funds to do so. In contrst to India with relatively powerful indigenous powers. Similarly Africa p
It's probably not a conincidence that the initial tradingpost/strongholds were largely commercially organised whereas later on when the states themselves did it it focused more and more on controlling people and places. I woudl say it's largely a question of needs and means. The trading companies were in it for profit and there is only so much wealth you can get before costs become unbearable. The EIC sorta ran into this in India and was subsequently disbanded by the crown.