Question: when did the union of independent central american states begin to fall apart
[{'answer': '1838', 'provenance': [{'wikipedia_id': '196323', 'title': 'Federal Republic of Central America', 'start_paragraph_id': 3, 'start_character': 223, 'end_paragraph_id': 3, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '196323', 'title': 'Federal Republic of Central America', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 495, 'bleu_score': 0.87051061094823, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3070961026729520102}, 'section': 'Section::::Abstract.'}]}]