Why does the US accent sound like Irish accent?

There are a number of similarities between the American and Irish accents, but also important differences. Some similarities include:

Rhoticity: Both American and Irish English are rhotic, meaning that the letter "r" is pronounced in all positions, including at the end of words. This is in contrast to some other English accents, such as Received Pronunciation (RP), which is non-rhotic.

L-vocalisation: In both American and Irish English, the letter "l" is sometimes vocalised to a sound similar to the vowel "ah". This is most common in unstressed syllables, such as the final syllable of the word "little".

T-glottalisation: The letter "t" is sometimes glottalised in both American and Irish English, meaning that it is pronounced with a stop at the glottis instead of with a full release. This is most common in unstressed syllables, such as the final syllable of the word "button".

Accent reduction: There has been a trend towards accent reduction in both American and Irish English in recent years. This is due to a number of factors, including increased mobility and communication between different parts of the world, and the influence of the media.

Despite these similarities, there are also a number of important differences between the American and Irish accents. Some of these differences include:

Vowel sounds: The vowel sounds in American and Irish English are different. For example, the vowel sound in the word "cat" is pronounced with a more "ah"-like sound in American English, while in Irish English it is pronounced with a more "eh"-like sound.

Consonant sounds: The consonant sounds in American and Irish English are also different. For example, the consonant sound in the word "th" is pronounced with a hard "th" sound in American English, while in Irish English it is pronounced with a softer "th" sound.

Intonation: The intonation of American and Irish English is different. American English is typically spoken with a more monotone intonation, while Irish English is spoken with a more rising and falling intonation.

Overall, the American and Irish accents are similar in some ways but different in others. These differences are due to a number of factors, including geography, history, and culture.