It historically is, however, just as American English is. Moreover, it fits well the general pattern of IE languages evolving towards the use of syntax to mark parts grammatical relationships rather than noun declension and verb conjugation. Danish, from which we get the word “are” is another example, being in some respects morphologically simpler even than English. The danish version of the word “are” is used for all the persons and numbers of the present tense “to be”–“am”, “is”, “are”. (Quoth Wikipedia).
Other telltale signs demonstrate the overarching relationship among the IE languages with respect to gender. For example, the various words for hand, in both Germanic and Romance languages, look like it “ought” to be either masculine or neuter: la main (French.), la mano (Spanish), die Hand/(Ger.), and hond (Old Norse) all betray characteristics that more usually belong to masculine or neuter nouns, mainly the single syllable composition ending in a consonant cluster, or in the case of Spanish, the *-o ending, which otherwise is almost always masculine. The German and Norse examples further show this in that their plurals, Haende and hendi are formed with umlaut; again, usually seen only in masculine or neuter nouns.
Apart from the analysis of IE languages and the custom of mapping grammatical gender to biological sex, it should be noted that the word gender is a cognate to genus and generic as used in taxonomy, and simply means a class or category of words. In other language families gender of nouns may not be mapped to biological sex at all, and there can be more than three. At least one African language has six genders.
It is arguable that IE is in general evolving away from grammatical gender. English is an obvious example, but most other Germanic languages show simplification of the grammatical gender structure. In Dutch, there remains the neuter (definite article het, but the masculine and feminine have merged into a so-called "common gender. Similar developments can be observed in some of the Scandinavian languages. In German itself, which remains the most morphologically intricate Germanic language, the early stages of a simplification process are underway, as the genitive case is merging with dative in certain constructions, and the plural genders long ago merged, causing the plural number to behave in many respects like a fourth gender.