What? in spanish..Do you mean history? The answer would be Air brakes, which happened in 1869. hope this helps
La is the definite article for feminine nouns. Ex: La Fruta: The Fruit (Note: la and fruta both end in "a". That's how you know it's a feminine noun.)
For El it is the definite article for masculine nouns. Ex: El Libro: The Book (Note: for el, nouns end in "o")
1- Conoces
2- no la conozco
3- perteneces
4- no pertenezco
5- reconozco
6- mercer doesn’t exist (merezco)