It depends on the state: each one decides. These examples are checked in their official source.
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New York
Yes, with conditions
If your degree is not equivalent to a U.S. law degree in length or in content (only one of the two), an LL.M. makes up for it. With a degree from a civil-law country, as in every Spanish-speaking country, you always need one, because the rule allows equivalence in content only if your country's law is based on the English common law. The LL.M.: 24 credits in in-person classes at an ABA-approved law school, over at least two semesters and within 24 months. It must include professional responsibility, legal research and writing, and American legal studies (2 credits each), plus 6 credits in subjects tested on the New York exam.
Note: Online courses do not count. First you must ask the Board for an advance evaluation, ideally a year before the exam.
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Texas
Yes, with conditions
With a degree from a civil-law country, the LL.M. is required, and you must also be authorized to practice in your country or in another state (rule 13, section 5): without that authorization, the LL.M. is not enough. The LL.M.: at least 24 credits at an approved law school, over two or more semesters of 13 weeks and within 24 months. It must include professional responsibility; legal research, writing and analysis; and an introduction to U.S. law (2 credits each), plus 6 credits in subjects tested on the Texas exam.
Note: Besides classes on campus, synchronous online classes, taught live by an approved law school, also count. But an LL.M. taken that way will not work for New York later, which does not count online courses.
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California
Only if you are not admitted in another country
If you are already a lawyer admitted in another country, you can take the exam with no additional study and without the First-Year Law Students' Examination (FYLSX, the "baby bar"). If you are not, you need, among other requirements, one year of law study at an ABA-approved or California-accredited law school, and an LL.M. can meet it.
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District of Columbia
Yes, with conditions
26 credits at an ABA-approved law school, in single-subject courses among those tested on the UBE. In addition, an evaluation by a service approved by the Committee on Admissions must certify that your education is equivalent to that of a U.S. law school or meets the requirements to practice in your country.
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Louisiana
A full LL.M. is not needed
With an equivalency determination for your education, 14 semester credits in certain subjects at an ABA-accredited law school are enough, up to 6 of them by distance learning.
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Arizona and Colorado
For a limited license
Besides the exam, in these two states a foreign-trained lawyer with an LL.M. can apply for a limited license: Legal Paraprofessional in Arizona (with an LL.M. from an ABA law school) and Licensed Legal Paraprofessional in Colorado (with an LL.M. that meets its rule 204.3). Both also require experience and an exam.
See the limited licenses
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Florida
Only together with practice in another state
An LL.M. on its own is not enough: with a foreign degree, you first need to be admitted and to practice in another U.S. jurisdiction. With an LL.M. from an ABA law school that meets the Florida Board of Bar Examiners' criteria, two years of practice are enough; without it, five. That is why many foreign-trained lawyers take the New York exam first.