Forcing someone to take two contiguous weeks out of the office means that someone else will need to be briefed for continuity and there's an enhanced chance of detecting "weirdness" that might be associated with a fraudulent scheme.
What makes you think they have no legal leg to stand on to dictate when you take your holiday?
My understanding is unless you have some contract saying otherwise, they can tell you to take your holiday whenever they want to, and you have no inherent right to take it whenever you want and for whatever length you want.
That's not even just the US - even in countries with stronger employees rights like the UK I believe this is the case.
For example this is the guidance from a union in the UK
> You do not necessarily have the right to choose when you take your holiday and your employer can tell you when to take your leave.
https://worksmart.org.uk/work-rights/hours-and-holidays/holi...
However, if the employee "chooses" not to use up all their accrued vacation time before it expires, generally compensation is not required...
Your boss's stated reasons for compelling you to do a thing are often not his real reasons.
(Not saying I agree, but that's what they say.)