An user Spanish
says…

Así
Adverb
  se
Pronoun
  convirtió
Verb
  en
Adposition
  la
Determiner
  Segunda
Adjective
  dama
Noun
  de
Adposition
  los
Determiner
  Estados Unidos
Estados Unidos
.

Thus she became the Second Lady of the United States.
Words and sentences
New
así

New
convirtió

third-person singular preterite indicative of convertir

New
en

  1. in, at, on
  2. in (a time)
  3. in (a language)
  4. used after some verbs and translated by various prepositions in English
  5. in (in various expressions)

New
la

New
dama

  1. lady, dame
  2. a female member of the court of honor at a quinceañera
  3. queen
  4. king

New
de

New
los

Estados Unidos
New
Estados Unidos

United States (a country in North America)

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